(19)

(11)

EP 0 835 433 A1

(12)

(43) Date of publication: 15.04.1998 Bulletin 1998/16 (21) Application number: 96923733.0 (22) Date of filing: 26.06.1996

(51) International Patent Classification (IPC):  G01M 13/ 02( . ) (86) International application number: PCT/US1996/011472 (87) International publication number: WO 1997/001749 (16.01.1997 Gazette 1997/04)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI SE (30) Priority: 28.06.1995 US 19950000586 (71) Applicant: THE GLEASON WORKS Rochester New York 14692 (US)	(72) Inventors: REESE, John, L. Farmington, NY 14425 (US) HANCOCK, Kim, R. Rochester, NY 14609 (US) (74) Representative: Harrison, David Christopher, et al  MEWBURN ELLIS York House 23 Kingsway London WC2B 6HP London WC2B 6HP (GB)